package com.xdy.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.xdy.reggie.common.BaseContext;
import com.xdy.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Slf4j
@WebFilter(filterName = "checkLoginFilter",urlPatterns = "/*")
public class CheckLoginFilter implements Filter {

    private static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        String requestURI = request.getRequestURI();
        log.info("拦截请求 ===> {}",requestURI);

        String[] urls = {
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login",
                "/doc.html",
                "/swagger-resources/**",
                "/webjars/**",
                "/v2/api-docs"
        };
        boolean check = check(urls, requestURI);
        if (check){
            filterChain.doFilter(request,response);
            return;
        }

        //判断员工是否登录
        if (request.getSession().getAttribute("employee") != null){
            log.info("用户已登录！");
            BaseContext.setCurrentId((Long) request.getSession().getAttribute("employee"));
            filterChain.doFilter(request,response);
            return;
        }

        //判断用户是否登录
        if (request.getSession().getAttribute("user") != null){
            log.info("用户已登录！");
            BaseContext.setCurrentId((Long) request.getSession().getAttribute("user"));
            filterChain.doFilter(request,response);
            return;
        }

        log.info("用户未登录！");
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }

    /**
     * 检查请求URI是否被放行
     * @param urls
     * @param requestURI
     * @return
     */
    private boolean check(String[] urls, String requestURI) {
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match){
                return true;
            }
        }
        return false;
    }
}
